Indicator-lock



(No Model.)

C. LINDSTRM.

INDICATOR LOCK.

Patented Sept. 6, 1892.

ANITED STATES PATENT FFICE.

CHARLES LINDS'IROM, OF ALTOONA, PENNSYLVANIA.

INDICATOR-LOCK.

SPECIFICATION forming part of Letters Patent No. 481,960, datedSeptember 6, 1892.

Application tiled Apri119, 1892.

To @ZZ whom it may concern:

Be it known that I, CHARLES LINDsTRoM, of the city of Altoona, county ofBlair, and State of Pennsylvania, have invented a certain new and usefulLock Attachment, of which the following is a true and exact description,reference being had to the accompanying drawings, which form a part ofthis specification.

My invention relates to an attachment to locks, by which a sign is madeto indicate whether or not the lock is shut or open.

The nature of my invention will be best uuderstood as described inconnection with the drawings, in which it is illustrated, and in which-Figure 1 is a front View of a door provided with my device. Fig. 2 is afront elevation, on alarger scale, of my device connected with the door.Fig. 3 is a side elevation or view of the edge of the door, and Fig. 4is a section on line 1 2 of Fig. 3.

A is the Wall of the chamber; B, the door.

C is a lock of ordinary construction, having a latch D and lock-bolt E.

F is a keyhole through which a key is introduced to act on bolt E. Asthis is no part of my invention, I have not illustrated the key or itsconnection with the bolt.

G is a thumb-latch secured 011 the end of a shaft H, to which shaft issecured a nger J, which engages in a recess e of the bolt. In thisway'the bolt can be moved by turning shaft H; or, if the bolt is movedby a key, the shaft H turns to a corresponding degree. This shaft H is afamiliar device and is generally only long enough to insure a properengagement with the bolt. I, however, prolong it,

as indicated at H', providing a bearing in a plate I to sustain itsouter end H', as shown.

This plateI may be cast integral with the Serial No. 429,749. (Nomodel.)

vshaft I secure a linger L, which engages in a notch M' of a rod M,which is inserted in a groove P in the edge of the door, the groovebeing closed by a strip Q.

'lo the top of rod M is secured a plate N, having appropriateinscriptions on its face and preferably situated beneath aplate O,having a slot O', which permits one inscription to be displayed at a time.Obviously as the lock-bolt is moved out or in the shaft H H', turningwith it, will thrust the rod Mpp or draw it down, thus moving theinscribed plate to display the appropriate notice.

Having now described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

l. In combination with a door, a lock-bolt, a shaft H, arranged to turnas bolt moves out and in, a rod M, having a sign N at its top, a plateO, arranged to rinclose the sign and having a slot O' for its display,and a lever L, secured to shaft H and engaged with rod M, as described,so as to move the rod and sign when the bolt is moved.

2. In combination with a door, a lock-bolt, a shaft H, arranged to turnas the bolt moves in or out, said shaft extendingin through the doorbeyond the lock, a rod M, inserted in the door, a lever L, secured toshaft H and engaged with rod M, a sign at the head of rod M, and anopening O in the side of the door for the display of said sign.

CHARLES LINDSTROM.

Witnesses:

GEO. S. WALTON, WM. C. STEARNs.

